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Midterm

BIOL202 Midterm: PHYLUM CHORDATA


Department
Biology
Course Code
BIOL 202
Professor
Laurene M Ratcliffe
Study Guide
Midterm

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PHYLUM CHORDATA
Deuterostomate development
Can live in colonies or alone
Go through metamorphosis
Subphylum Urochordata (tunacles, seas squirts)
Subphylum Chephalocordata (lancelets)
Subphylum Craniata
Symmetry
Bilateral symmetry
Invertebrate Skeletal Structure
Mineralized (notochord – in juvenile larval stage)
Hydrostatic (Class Urochordata)
Nonmuscular/Muscular Movement
Jet propulsion (through siphons)
Pedal locomotion
Invertebrate Nervous System
Brain (tubular nerve cord)  central nervous system
Single ganglion along body wall (Class Urochordata)
Invertebrate Sensory Organs
Chemoreceptors
Mechanical stimuli
BUT NO COMPLEX SENSORY ORGANS (Class Urochordata)
Gas Exchange
Gills (on pharyngeal slits)
Di/usion
Transport System
Closed cardiovascular system
Blood 0ow through heart is not unidirectional
Feeding
Endostyle (thyroid gland) secretes mucus for 2lter feeding
Suspension feeding
Digestion
Complete digestive tract
Reproduction
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